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Seems to be a personal choice item. If you do use anti-seize, remember that the slipperines results in greater torque being applied than you might expect. Torque is all about the friction between the theads...a liquid, even oil, can make the threads slip more easily, resulting in a greater clamping force. I just read something by Tom Cutter who writes the racing column in the ON. He recalled a situation where one race team mechanic thought anti-seize was a good idea on the plugs for a race bike. The other mechanic didn't know it had been used and dialed in the specified torque for the plug...snapped it off in the head. Ruined the day for the racer.

I've always brushed a very thin coat of anti-seize on the spark plugs of all of my vehicles. I use the minimum specified torque. We also used anti-seize on the spark plugs of the aircraft where I worked.

I also use anti-seize on the lug nuts of my car. The manufacturer specified a product that according to them, does not affect the lug nut torque. I have trouble buying that, but who am I to argue with Porsche.

BMW bike plugs don't stay in very long if you ride normally (only a few seasons at most and a season or less for some) and service at factory intervals. And torque is low with good access. So I don't use anti seize in this case. Heads don't get very hot, not at all like exhaust bolts, etc..

I prefer graphite dry lube on lug nuts but don't own a Porsche (used to call them rolling roadblocks at the track but their club racer is surely a very durable tool for play)..Nothing wrong with a tiny dab of antiseize though- torque and heat are a lot higher in this application-

If you decide to use antiseize make sure that it is catalytic converter friendly.

Its use doesn't mean it's going to be "allowed" to go past the point of use. IMO,it can even be used on a sensor if in the safe proportion. That ought to be enough to bring comments

"If I had my life to live over, I'd dare to make more mistakes next time...I'd relax,I'd limber up... I would take fewer things seriously...take more chances... take more trips...climb more mountains...swim more rivers...eat more ice cream." Jorge Luis Borges at age 85.

The spark plug threads are stainless steel and the heads are alloy. Both items are subjected to intense heat (and subsequent cooling) cycles. My opinion: unless you really like the idea of galling or fretting, YES, and just a little dab'll do ya.

Filling the tiny voids between the plug threads and the head threads may also help with heat transfer.

If it's getting into the combustion chamber and therefore becoming an issue for the cat, you've used too much.

When I'm feeling anally retentive (frequent these days), after I put some on the plug, I'll screw it in most of the way, and then remove it again & wipe off the excess that the insertion has pushed up the threads; then I'll tighten it down.